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  <xsd:element id="ghm_MinimumFixedChargeCoverageRatio" name="MinimumFixedChargeCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_RefiningMember" name="RefiningMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_MaximumLeverageRatioUponAcquisition" name="MaximumLeverageRatioUponAcquisition" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_TermLoan" name="TermLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_NumeratorAbstract" name="NumeratorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_IncreaseDecreaseInDefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" name="IncreaseDecreaseInDefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_ProductWarrantyAccrualAcquired" name="ProductWarrantyAccrualAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_HSBCBankUSAMember" name="HSBCBankUSAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_PercentageOfMinimumMarginedAssetsOnOutstandingFacility" name="PercentageOfMinimumMarginedAssetsOnOutstandingFacility" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross" name="IndefiniteLivedIntangibleAssetsExcludingGoodwillGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_SelfInsuredMedicalPlanLiability" name="SelfInsuredMedicalPlanLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_LetterOfCreditCommitmentFeePercentage" name="LetterOfCreditCommitmentFeePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_LeasesLineItems" name="LeasesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_BarberNicholsIncMember" name="BarberNicholsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_ChangeInContractWithCustomerAssetLiabilityNet" name="ChangeInContractWithCustomerAssetLiabilityNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_LesseeOperatingAndFinanceLeaseRemainingTermOfContract" name="LesseeOperatingAndFinanceLeaseRemainingTermOfContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_FiveYearTermLoanWithBankOfAmericaMember" name="FiveYearTermLoanWithBankOfAmericaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_TimeVestOneThirdPerYearPercentageMember" name="TimeVestOneThirdPerYearPercentageMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_ChangeInContractWithCustomerLiability" name="ChangeInContractWithCustomerLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_ChangeDueToRevenueRecognizedContractAssets" name="ChangeDueToRevenueRecognizedContractAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_LineOfCreditFacilityCovenant" name="LineOfCreditFacilityCovenant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_OtherOperatingIncomeNetLineItems" name="OtherOperatingIncomeNetLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_RemainderOperatingLeasePayment" name="RemainderOperatingLeasePayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_MinimumFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortization" name="MinimumFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_SellingGeneralAndAdministrativeAmortizationExpense" name="SellingGeneralAndAdministrativeAmortizationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_TechnologyAndTechnicalKnowHowMember" name="TechnologyAndTechnicalKnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesRemainingAvailableForGrant2000Plan" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesRemainingAvailableForGrant2000Plan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ghm_BackEndFeeCharged" name="BackEndFeeCharged" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_ProductWarrantyIncome" name="ProductWarrantyIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_ContractWithCustomerReceivablesBilledButNotPaidUnderRetainage" name="ContractWithCustomerReceivablesBilledButNotPaidUnderRetainage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_BloombergShortTermBankYieldIndexMember" name="BloombergShortTermBankYieldIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_LesseeOperatingAndFinanceLeaseLiabilityMaturityTableTextBlock" name="LesseeOperatingAndFinanceLeaseLiabilityMaturityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_RepaymentsOnLeaseFinancingObligations" name="RepaymentsOnLeaseFinancingObligations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_TransactionAgreementMember" name="TransactionAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_LesseeOperatingAndFinanceLeasesTextBlock" name="LesseeOperatingAndFinanceLeasesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_ChemicalPetrochemicalMember" name="ChemicalPetrochemicalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_AccumulatedTaxEffectMember" name="AccumulatedTaxEffectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_PercentageOfRevenueFromContractsWithCustomersExcludingAssessedTaxPerformanceObligationSatisfiedOverTime" name="PercentageOfRevenueFromContractsWithCustomersExcludingAssessedTaxPerformanceObligationSatisfiedOverTime" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_LineOfCreditFee" name="LineOfCreditFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_StockCompensationPriorPlanMember" name="StockCompensationPriorPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_PerformanceVestOneThirdPerYearPercentageMember" name="PerformanceVestOneThirdPerYearPercentageMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_PensionAdjustmentsNetOfIncomeTax" name="PensionAdjustmentsNetOfIncomeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_PercentageOfRevenueFromContractsWithCustomersExcludingAssessedTaxPerformanceObligationSatisfiedAtPointInTime" name="PercentageOfRevenueFromContractsWithCustomersExcludingAssessedTaxPerformanceObligationSatisfiedAtPointInTime" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ghm_OtherOperatingIncomeNetTable" name="OtherOperatingIncomeNetTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_IncreaseDecreaseInOperatingLeaseRightOfUseAsset" name="IncreaseDecreaseInOperatingLeaseRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_FloorRateMember" name="FloorRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_IncreaseDecreaseInAccruedCompensationAccruedExpensesAndOtherCurrentAndNonCurrentLiabilities" name="IncreaseDecreaseInAccruedCompensationAccruedExpensesAndOtherCurrentAndNonCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_ChangeDueToInvoicingCustomersAdditionalDepositsContractAssets" name="ChangeDueToInvoicingCustomersAdditionalDepositsContractAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ghm_LetterOfCreditSecuredByCashMember" name="LetterOfCreditSecuredByCashMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_PerformanceVestedRestrictedStockMember" name="PerformanceVestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_ContractWithCustomerAssetsAndLiabilitiesTable" name="ContractWithCustomerAssetsAndLiabilitiesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_DenominatorAbstract" name="DenominatorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ghm_NoncashOrPartNoncashAcquisitionEquityInstrumentConsiderationValueOfTreasurySharesIssued" name="NoncashOrPartNoncashAcquisitionEquityInstrumentConsiderationValueOfTreasurySharesIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ghm_BankOfAmericaMember" name="BankOfAmericaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
</xsd:schema>
